Merge "Give each preference screen its own activity and toolbar title" into sc-dev am: 8d6ca68786 am: 750a30eaad am: c3d23c04e5

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14709732

Change-Id: I3cc40487a6deb0a44f9064e23fd930666b6a033d